Improved rolling-apparatus



E. M. DAVIS,

I Rolling Iron.

No. 90,933. Patented June 8, 186 9 hwenTo-r wfl'nesses poQuaJ-d 9% N, PETERS. UbobUflmghwMr. Wuhingbn. 0.6.

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, EDWARD M. DAVIS, or PITTSBURG, PENNSYLVANIA, AssIoNoR To GEORGE R. DUNCAN, OF sAME PLACE.

Letters Patent No. 90,933, dated June 8, 1869.

IMPROVED ROLLING-APPARATUS.

The Schedule referred to in these Letters Patent and making part of the same.

To all' whom it may concern v Be it known that I, EDWARD M.DAv1s, of the city of Pittsburg, in the county of Allegheny, and State of Pennsylvania, have invented a new and useful Improvement in Rolls for Rolling Taperlron; and l'do hereby declare the following to be a full, clear, and exact description thereof; reference being had to the accompanying drawing, making a part of this specification, which shows a front elevation of a pair of cylindrical metallic rolls and housings, each roll grooved with a spiral groove, such groove decreasing in size in cross-section from one end to the other.

The nature of the invention which the drawing is designed to illustrate, consists in grooving a pair of cylindrical metallic rolls with spiral grooves, of any desirable shape in cross-section, in such way that the spiral grooves on the two folls'shall run in opposite directions, and be opposite to each other as the rolls revolve, and shall increase or decrease in size in crosssectionthrough some part of their length, thereby rolling metallic bars, sheets, rods, or shafts of tapering shape, or of varying width and thickness.

To enable others skilled in the art to make and use my invention, 1' will proceed to describe its construction and mode of operation.

a a are two cylindrical metallic-rolls, mounted in any suitable housing, I), with set-screws c, and other devices ordinarily used or required therewith.

Running from end to end, and spirally around each roll a, is a groove, 0, of triangular shape in cross-secti'on, as shownin the drawings, or of other regular or irregular shape, atpleasure.

in size toward the base of the spiral, so as to roll taper bars of iron, or other metal, the taper being toward the end last rolled. v

I do not limit myself to any particular shape or size of grooves in cross-section, since such grooves may and should be adapted in shape and size to the work to be done. They may be rectangular, semicircular, square, oval, or otherwise, large or small, and taper rapidly or slowly, at pleasure; or the grooves in the two rolls may be differently shaped, or one roll may be grooved, as described, and the other made plain.

Such rolls may be applied to rolling not only taper bars, but also articles manufactured of iron which decrease in size from either, toward the other end, such as wagon or buggy-spokes, or from the' middle toward either end, as car-axles, &c., each end, in such case,

being rolled separately.

These grooves e taper As it will sometimes happen that the iron employed will not all have passed through the rolls when the small end of the spiral e is reached, I turn down one or both of the rolls, as at i, so as to reduce its diameter to any desirable width and depth, so that such bar may be passed through, and be taken from the rolls. This groove, or out-away part should, however, be

at the point at which it isdesirable to deliver the bar 7 the proper length may be passed through between rolls so grooved, or the article to be made can be rolled on the end of a bar, out off, and the rolling repeated.

Rolls have been made with a succession of parallel tapering grooves, and flanged and grooved rolls have been used, the flanges entering the grooves, which ruusspirally around the body of the roll, and gradually diminishing in depth, so as; to taper the metal as it passes through the machine; but these devices are not like mine, and liable to the serious objection that the operative surfaces of the rolls cannot be of equal diameter, as the diameter of the operative face of the grooved roll must constantly diminish, while the operative face of the flanged roll either increases in diameter, or remains unchanged, and in either case the iron will be drawn more on one side than the other, owing to the different surface-speed of the rolls, and the machine will not work well.

My taper grooved rolls obviate this (liiticulty, as the operative face of the grooves remains of the same diameter in both rolls.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is-- The groove 0, extending spirally around one or both of a pair of cylindrical metallic rolls, arranged as herein described, in combination with a cut-away, or depression at the termination of the groove, for the purpose of delivering the metal from the machine,

In testimony whereof, I, the said EDWARD M. DA- vIs, have hereunto set my hand.

EDWD. M. DAVIS.

Witnesses:

S. SMITH, J OHN l. FAULKNER. 

